Firms have invested heavily in information systems that collectively form an enterprise’s system. While many senior executives believe their enterprises’ systems have been “deployed” successfully they also believe they fall short of their potential informational impact. This research bridges deployment-related and impact-related assimilation research by recognizing the important role information integration plays in achieving significant informational impact from enterprise systems. We define information integration as the extent to which enterprise systems have been integrated to enable delivery of the right information to the right person at the right time and information impact as the extent to which information is utilized to support and enable business strategies and activities. After investigating the relationship between information integration and information impact, we identify and test the antecedents to information integration including external pressure and information systems resources. This research, when completed, will provide an important extension to the assimilation and information research streams.